Vol. 12, Issue 11 (2023)

Author(s):
SK Thakur, Rishi Pathak, Ajay Ahirwar and RK Nema

Abstract:
Spectral response of any surface on earth is determined by measuring reflected energy from that surface and comparing with the incident radiation measured on a standard plate coated with barium sulphate. It has been observed that percentage reflectance in different crops has a defined trend from sowing to harvesting in normal weather conditions. However this trend is affected if the incident light radiations vary significantly. The present study was conducted to establish the reflectance pattern in different rabi crops and to relate the response obtained with the available ground information with variation of differernt incident radiation. Optimum time span was identified for distinguishing the different rabi crops namely Mustard, Potato, Onion, Wheat, Marigold, Vegetable Pea, Chickpea, Garlic and Berseem using hand held spectro radiometer based on their spectral signatures at Research farm under the department of Agronomy, College of Agriculture, Jawaharlal Nehru Krishi Vishwa Vidayalaya, Jabalpur, during 2009-10. This area lies in the central part of Jabalpur district, Madhya Pradesh. It has a typical subtropical climate with hot dry summers and cool dry winters The experimental plots during both the seasons have sandy – clay soil, with normal soil reaction and electrical conductivity, low in organic carbon and available nitrogen and medium in available phosphorus and potassium. The difference of average reflectance is increasing from Band 1 (BLUE) to Band 4 (NIR) during the crop growth from 66 to 130 DAS. Variation in incident energy during the growth period and its effect on reflectance was studied for field and vegetable crops. The results are useful to plan for accepting or discarding the recorded observation for further analyses.